ATmega644P Automotive Atmel Corporation, ATmega644P Automotive Datasheet - Page 51
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ATmega644P Automotive
Manufacturer Part Number
ATmega644P Automotive
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644P Automotive
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
Temp. Range (deg C)
-40 to 125
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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9.0.4
7674F–AVR–09/09
External Reset
Figure 1. MCU Start-up, RESET Tied to V
Figure 2. MCU Start-up, RESET Extended Externally
Table 1. Power On Reset Specifications
Note:
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
delay counter starts the MCU after the Time-out period – t
INTERNAL
TIME-OUT
Symbol
V
V
V
V
POT
PORMAX
PORMIN
CCRR
RESET
INTERNAL
V
RESET
TIME-OUT
CC
V
RESET
CC
RESET
1. Before rising, the supply has to be between
V
CCRR
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
VCC Max. start voltage to ensure internal
Power-on Reset signal
VCC Min. start voltage to ensure internal
Power-on Reset signal
VCC Rise Rate to ensure Power-on Reset
V
V
V
RST
PORMA X
“System and Reset Characteristics” on page
PORMIN
t
TOUT
CC
V
RST
ATmega164P/324P/644P
t
TOUT
V
PORMIN
(1)
TOUT
and V
– has expired.
0.01
Min
-0.1
1.1
0.8
PORMAX
RST
– on its positive edge, the
Typ
1.4
1.3
to ensure a Reset.
332) will generate a
Max
1.7
1.6
0.4
Units
V/ms
V
V
V
V
51
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